多平台响应键盘事件！（适用于Cocos2dx 3.0 alpha以上版本）

Hello everyone! For a week I’ve been looking on how to make a keyboard work!
I managed to figure it out and I want to share my knowledge with you!
So, before we get started - this tutorial only works on Cocos2d-x 3.0alpha and later.
We will start by making two functions in the scene we want keyboard on.
They will be:

首先在需要键盘处理事件的场景中文件中添加如下两个函数。

OurScene.h:

void keyPressed(cocos2d::EventKeyboard::KeyCode keyCode, cocos2d::Event *event);

void keyReleased(cocos2d::EventKeyboard::KeyCode keyCode, cocos2d::Event *event);

OurScene.cpp:

void OurScene::keyPressed(cocos2d::EventKeyboard::KeyCode keyCode, cocos2d::Event *event)

void OurScene::keyReleased(cocos2d::EventKeyboard::KeyCode keyCode, cocos2d::Event *event)

These functions will be called when we press/release a key on the keyboard.
Next we need a listener to look for the keyboard we will create it like so (I did it in the init function)

当键盘按下时会调用上面这两的函数。

接下来在init()方法中添加如下代码来监听键盘事件。

auto keyboardListener = EventListenerKeyboard::create();

keyboardListener- onKeyPressed = CC_CALLBACK_2(OurScene::keyPressed, this);

keyboardListener- onKeyReleased = CC_CALLBACK_2(OurScene::keyReleased, this);

EventDispatcher::getInstance()- addEventListenerWithSceneGraphPriority(listener, this); // use if your version is below cocos2d-x 3.0alpha.1

// use this: Director::getInstance()- getEventDispatcher()- addEventListenerWithSceneGraphPriority(listener, this); if you are using cocos2d-x 3.0alpha.1 and later!

This code creates a keyboard listener and then setting what functions will be called when the key is pressed or released.
Now Our program can detect keyboard! Wait… How do I know what key is pressed? It is simple! Let me show you:

然后就可以在最上面的两个方法中添加keyCode的判定了。

//put this inside keyPressed or keyReleased

if (keyCode == EventKeyboard::KeyCode::KEY_W)

 CCLog("W key was pressed");

This piece of code will check what is the key-code of the key that was pressed. The list of key-codes is inside the EventKeyboard class. To use a keycode you just type:
EventKeyboard::KeyCode::KEY_**whatever key** - you will usually get a list of available keys to chose from.

Well, I think that’s it! Enjoy!

参考：http://www.cocos2d-x.org/forums/6/topics/39145

从0开发游戏引擎之Win32平台用户输入事件Input类实现 Input类主要实现的功能是 监听用户鼠标键盘事件，当收到操作系统回调之后首先会调到场景管理类，然后通过场景管理类，会调到Input类，然后Input类会传递给KeyInput类和MouseInput处理鼠标和键盘相关的逻辑代码。